package com.cg.p1_demo;

public class Demo {
    public static void main(String[] args) {
        //字符串常量
        System.out.println("Hello World");
        System.out.println("hgffcgc");
        //字符常量
        System.out.println('a');
        System.out.println(' ');
        //整数/小数
        System.out.println(666);
        System.out.println(888);
        System.out.println(66.6);
        System.out.println(6.66);
        //布尔类型
        System.out.println(true);
        System.out.println(false);
        //空
        String s = "null";
        System.out.println(s);
    }
}
